Our lampholders have a safety feature, which means that once put together, they cannot be unscrewed anymore. This is to ensure you don’t undo the lampholder when changing the bulb and give yourself a nasty electric shock! To attach a power cord to the lampholder, you need to unscrew the base first. To do this, you have to push down the retention pin inside the lampholder (e.g. with a screwdriver) and unscrew the upper ring.